Picosecond gain-switched polymer fiber random lasers  

作　　者：杜文彧 高森 张小娟 李思祺 蒯雁 王治强 曹志刚 徐峰 刘宇 徐林 张俊喜 谢康 俞本立 胡志家 Wenyu Du;Sen Gao;Xiaojuan Zhang;Siqi Li;Yan Kuai;Zhiqiang Wang;Zhigang Cao;Feng Xu;Yu Liu;Lin Xu;Junxi Zhang;Kang Xie;Benli Yu;Zhijia Hu(Information Materials and Inteligent Sensing Laboratory of Anhui Province,Key Laboratory of Opto-Electronic Information Acquisition and Manipulation of Ministry of Education,School of Physics and Opto-electronics Engineering,Anhui University,Hefei 230601,China;School of Instrument Science and Opto-electronics Engineering,Laboratory of Optical Fibers and Micro-nano Photonics,Hefei University of Technology,Hefei 230009,China;School of Opto-electronic Engineering,Zaozhuang University,Zaozhuang 277160,China)

机构地区：[1]Information Materials and Intelligent Sensing Laboratory of Anhui Province,Key Laboratory of Opto-Electronic Information Acquisition and Manipulation of Ministry of Education,School of Physics and Opto-electronics Engineering,Anhui University,Hefei 230601,China [2]School of Instrument Science and Opto-electronics Engineering,Laboratory of Optical Fibers and Micro-nano Photonics,Hefei University of Technology,Hefei 230009,China [3]School of Opto-electronic Engineering,Zaozhuang University,Zaozhuang 277160,China

出　　处：《Chinese Optics Letters》2024年第4期20-25,共6页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.12174002,11874012,11874126,and 51771186);the Excellent Scientific Research and Innovation Team of Anhui Province(No.2022AH010003);the Key Research and Development Plan of Anhui Province(No.202104a05020059);the Innovation Project for the ReturnedOverseasScholarsofAnhuiProvince(No.2021LCX011);the University Synergy Innovation Program of Anhui Province(No.GXXT-2020-052);the Anhui Young Wanjiang Scholars Talent Project(No.Z010118167)。

摘　　要：Random lasers are a type of lasers that lack typical resonator structures,offering benefits such as easy integration,low cost,and low spatial coherence.These features make them popular for speckle-free imaging and random number generation.However,due to their high threshold and phase instability,the production of picosecond random lasers has still been a challenge.In this work,we have developed three dyes incorporating polymer optical fibers doped with various scattering nanoparticles to produce short-pulsed random fiber lasers.Notably,stable picosecond random laser emission lasting600 ps is observed at a low pump energy of 50μJ,indicating the gain-switching mechanism.Population inversion and gain undergo an abrupt surge as the intensity of the continuously pumped light nears the threshold level.When the intensity of the continuously pumped light reaches a specific value,the number of inversion populations in the“scattering cavity”surpasses the threshold rapidly.Simulation results based on a model that considers power-dependent gain saturation confirmed the above phenomenon.This research helps expand the understanding of the dynamics behind random medium-stimulated emission in random lasers and opens up possibilities for mode locking in these systems.

关 键 词：random laser polymer optical fiber gain-switched laser picosecond pulse 

分 类 号：TN248[电子电信—物理电子学]